By Bestbuy.com

3M - PF213C3B Frameless Blackout Privacy Filter for 21.3 in. Flat Panel Monitor - Black

3M Black Privacy Filters utilize ingenious microlouver technology to deliver world-class effective privacy for laptops and monitors. Side views are blacked out from prying eyes while your screen remains clearly visible to straight-on views. 3M Black Privacy Filters fade to black starting at the 30 Degree side angle, are reversible between a glossy side and glare-reducing matte, and reduce 35% of blue light transmission.